20143177081 has 2 divisors, whose sum is σ = 20143177082. Its totient is φ = 20143177080.

The previous prime is 20143177069. The next prime is 20143177099. The reversal of 20143177081 is 18077134102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19927557225 + 215619856 = 141165^2 + 14684^2 .

It is a cyclic number.

It is not a de Polignac number, because 20143177081 - 2²¹ = 20141079929 is a prime.

It is a super-2 number, since 2×20143177081² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20143117081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10071588540 + 10071588541.

It is an arithmetic number, because the mean of its divisors is an integer number (10071588541).

Almost surely, 2^20143177081 is an apocalyptic number.

It is an amenable number.

20143177081 is a deficient number, since it is larger than the sum of its proper divisors (1).

20143177081 is an equidigital number, since it uses as much as digits as its factorization.

20143177081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9408, while the sum is 34.

The spelling of 20143177081 in words is "twenty billion, one hundred forty-three million, one hundred seventy-seven thousand, eighty-one".